<template>
  <div class="swiper-container" ref="mySwiper">
    <div class="swiper-wrapper">
      <div
        class="swiper-slide"
        v-for="(skuImage,index) in skuImageList"
        :key="skuImage.id"
        @click="changeIsDefault(index)"
      >
        <img
          :src="skuImage.imgUrl"
          @click="sendSkuImg(skuImage.imgUrl)"
          :class="{active:skuImage.isDefault === 1}"
        />
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
import Swiper from "swiper";
import { mapGetters } from "vuex";
export default {
  name: "ImageList",
  props: ["skuImageList"],
  methods: {
    //改变展示图片
    sendSkuImg(imgUrl) {
      //$emit发送数据
      this.$bus.$emit("getSkuImg", imgUrl);
    },

    // 小图片标红
    changeIsDefault(index){
      this.skuImageList.forEach(item=>{item.isDefault = 0})
      this.skuImageList[index].isDefault = 1
    }
  },

  beforeDestroy() {
    //解绑
    this.$bus.$off("getSkuImg");
  },

  watch: {
    //floor是父组件给与的props:它的props属性值从来没有变化过！！！！
    skuImageList: {
      immediate: true,
      handler() {
        this.$nextTick(() => {
          //初始化Swiper类的实例
          var mySwiper = new Swiper(this.$refs.mySwiper, {
            //设置轮播图防线
            direction: "horizontal",
            //开启循环模式
            //loop: true,
            // 如果需要前进后退按钮
            navigation: {
              nextEl: ".swiper-button-next",
              prevEl: ".swiper-button-prev",
            },

            //显示图片设置
            slidesPerView: 4,
            slidesPerGroup: 1,
            //切换效果
            //effect: "cube",
          });

          //1:swiper插件,对外暴露一个Swiper构造函数
          //2:Swiper构造函数需要传递参数 1、结构总根节点CSS选择器|根节点真实DOM节点  2、轮播图配置项
          //鼠标进入停止轮播
          mySwiper.el.onmouseover = function () {
            mySwiper.autoplay.stop();
          };
          //鼠标离开开始轮播
          mySwiper.el.onmouseout = function () {
            mySwiper.autoplay.start();
          };
        });
      },
    },
  },
};
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }

      &:hover {
        border: 2px solid #f60;
        padding: 1px;
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>